fix: comprehensive QA — resolve 13 bugs, add UX improvements across all services

Client SDK: add .catch() to graphRagStreaming/documentRagStreaming (silent timeout),
null-guard JSON.parse in getPrompts/getSystemPrompt/getPrompt.

Backend: implement "getvalues" config operation for token costs, null-check
createTerm() in FalkorDB triples query, add knowledge-cores service entrypoint
and Docker entry, return proper HTTP 400/404 for gateway error responses.

Workbench: cancel button + elapsed timer for chat, clear agent spinner on error,
flow dialog inline validation, responsive header wrapping, knowledge cores
loading timeout, sidebar/page naming consistency, theme toggle indicator.

Infrastructure: enable Grafana Explore for viewers, add gateway Prometheus
scrape target, fix RAG pipeline dashboard layout (6 panels visible),
filter Service Health to configured targets only.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ts/deploy/docker-compose.yml

@@ -66,7 +66,7 @@ services:
     networks:
       - trustgraph
     healthcheck:
-      test: ["CMD", "wget", "--spider", "-q", "http://localhost:6333/healthz"]
+      test: ["CMD-SHELL", "bash -c 'echo > /dev/tcp/localhost/6333'"]
       interval: 10s
       timeout: 5s
       retries: 3
@@ -179,6 +179,7 @@ services:
       - GF_AUTH_DISABLE_LOGIN_FORM=false
       - GF_USERS_DEFAULT_THEME=dark
       - GF_EXPLORE_ENABLED=true
+      - GF_USERS_VIEWERS_CAN_EDIT=true
       - GF_FEATURE_TOGGLES_ENABLE=traceqlEditor tempoSearch tempoServiceGraph
     depends_on:
       prometheus:
@@ -323,6 +324,18 @@ services:
       - trustgraph
     restart: unless-stopped
 
+  knowledge-cores:
+    image: trustgraph-ts:local
+    command: ["node", "entrypoints/cores.mjs"]
+    environment:
+      - NATS_URL=nats://nats:4222
+    depends_on:
+      nats:
+        condition: service_healthy
+    networks:
+      - trustgraph
+    restart: unless-stopped
+
   # ---------------------------------------------------------------------------
   # Document Processing Pipeline
   # ---------------------------------------------------------------------------